The question of how to best wash white hats depends largely on the material, so be sure to refer to instructions for each type of hat listed above.
Add a teaspoon or so of gentle, chemical-free laundry detergent to a large bowl of warm water. If you’re dealing with a basic material like cotton, the hat can be soaked. You can simply use a clean, white microfiber cloth to spot-clean the hat. Avoid bleaching agents, as these can damage the fabric or cause unevenness in color.
Keep in mind that hat makers often know how difficult their hats are to clean, so always check for a small tag listing care instructions. By following these few simple tips, your hat will back to peak condition in no time.